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# How Long Is 138 Minutes? Update

Let’s discuss the question: how long is 138 minutes. We summarize all relevant answers in section Q&A of website Ph.kienthuccuatoi.com in category: Information. See more related questions in the comments below.

## How much is 138 hour?

138 Hours is 5 Days and 18 Hours.

## How long is 1 minute exactly?

The minute is a unit of time usually equal to 160 (the first sexagesimal fraction) of an hour, or 60 seconds.

### Seconds, Minutes and Hours for Kids | Classroom Video

Seconds, Minutes and Hours for Kids | Classroom Video
Seconds, Minutes and Hours for Kids | Classroom Video

## How many minutes means 1 hour?

There are 60 minutes in 1 hour. To convert from minutes to hours, divide the number of minutes by 60.

## How many minutes are there in a min?

In one minute there is no minute

In 1 hour there is 60 minute.

## How long is a second?

Since 1967, the second has been defined as exactly “the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom” (at a temperature of 0 K and at mean sea level).

## Why does a minute have 60 seconds?

The Babylonians made astronomical calculations in the sexagesimal (base 60) system they inherited from the Sumerians, who developed it around 2000 B.C. Although it is unknown why 60 was chosen, it is notably convenient for expressing fractions, since 60 is the smallest number divisible by the first six counting numbers …

## Is 60 seconds the same as 1 minute?

There are 60 seconds in 1 minute. In other words, a second is 160 of a minute. The second is called the base unit of time. That means scientists defined one minute to be 60 seconds.

## What time will it be 3/4 hour?

Three fourths of an hour is 45 minutes.

## How many hrs are in a year?

One calendar common year has 365 days: 1 common year = 365 days = (365 days) × (24 hours/day) = 8760 hours.

### How far is a second?

How far is a second?
How far is a second?

## How many 30 minutes is 2 hours?

Now, we will add 30 minutes. Hence, 2 hours 30 minutes is equal to 150 minutes.

## How do you count seconds perfectly?

You can count seconds very roughly, without a watch, by saying at a steady rate: ONE (thousand), TWO (thousand), THREE (thousand), FOUR ….

## How long is 1 second in space?

It is defined as the distance that light travels in free space in one second, and is equal to exactly 299,792,458 metres (983,571,056 ft).
Light-second
1 light-second in … … is equal to …
SI units 299792458 m
astronomical units 0.0020040 AU 3.1688×108 ly 9.7156×109 pc
imperial/US units 186282 mi

## Who invented time?

The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today’s clocks measure. For the Egyptians, and indeed for a further three millennia, the basic unit of time was the period of daylight.

## Why is the clock 12 hours?

The Egyptians used a 12-hour sundial to tell time during the daytime and a 12-hour water clock at night. The Romans also used a 12-hour clock. Early mechanical clocks showed all 24 hours, but over time, clockmakers found the 12-hour system simpler and cheaper.

## Why is there 24 hours in a day and not 25?

Our 24-hour day comes from the ancient Egyptians who divided day-time into 10 hours they measured with devices such as shadow clocks, and added a twilight hour at the beginning and another one at the end of the day-time, says Lomb. “Night-time was divided in 12 hours, based on the observations of stars.

## How do you explain 24 hours in a day?

The 24-hour day concept comes from the ancient Egyptians. They divided the day into 10 hours with devices like shadow clocks and then added one hour at each end (one for twilight and one at the end of the day).

### How long is one minute ?

How long is one minute ?
How long is one minute ?

## What is 1 minute in the microwave?

On a microwave, if you push 60, then it will cook for 60 seconds or one minute. (Following me?) AND if you also press 1:00 it will cook for one minute, or 60 seconds.

## What is a minute and a half on a microwave?

Two and a half minutes is two minutes and thirty seconds.

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